Port Forwarding with iptables

I am a newbie with iptables.
I want to have all incoming traffic on port x redirect to internal ip address 192.168.136.55 on the same port x.
I have tried several syntaxes but they don't work.
Can you help me with the syntax for this please?

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I now have this entry in iptables:
iptables -t nat -A PREROUTING -p tcp -d 192.168.0.1 -dport 3389 -j DNAT --to-destination 192.168.0.55:3389
I restarted the Linux server because I didn't know if I had to refresh what is in the kernel.
I cannot reach the Windows server. I have checked to ensure the Windows server is accepting 3389.
Did I miss something?

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